Reviewed-by: Alistair Popple <apopple@xxxxxxxxxx> Ralph Campbell <rcampbell@xxxxxxxxxx> writes: > Add a simple test case for when hmm_range_fault() is called with the > HMM_PFN_REQ_FAULT flag and a device private PTE is found for a device > other than the hmm_range::dev_private_owner. This should cause the > page to be faulted back to system memory from the other device and the > PFN returned in the output array. > > Signed-off-by: Ralph Campbell <rcampbell@xxxxxxxxxx> > --- > tools/testing/selftests/vm/hmm-tests.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c > index 203323967b50..a5ce7cc2e7aa 100644 > --- a/tools/testing/selftests/vm/hmm-tests.c > +++ b/tools/testing/selftests/vm/hmm-tests.c > @@ -1520,9 +1520,19 @@ TEST_F(hmm2, double_map) > for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i) > ASSERT_EQ(ptr[i], i); > > - /* Punch a hole after the first page address. */ > - ret = munmap(buffer->ptr + self->page_size, self->page_size); > + /* Migrate pages to device 1 and try to read from device 0. */ > + ret = hmm_dmirror_cmd(self->fd1, HMM_DMIRROR_MIGRATE, buffer, npages); > + ASSERT_EQ(ret, 0); > + ASSERT_EQ(buffer->cpages, npages); > + > + ret = hmm_dmirror_cmd(self->fd0, HMM_DMIRROR_READ, buffer, npages); > ASSERT_EQ(ret, 0); > + ASSERT_EQ(buffer->cpages, npages); > + ASSERT_EQ(buffer->faults, 1); > + > + /* Check what device 0 read. */ > + for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i) > + ASSERT_EQ(ptr[i], i); > > hmm_buffer_free(buffer); > }
